hellorust20xx 0.1.0

A crate for test
Documentation 
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use foo::print2;
#[derive(Debug, PartialEq)]
enum E {
    X,
    B(String),
}

include!(concat!(env!("OUT_DIR"), "/hello.rs"));

extern {
    fn hello();
    fn abs(_: i32) -> i32;
}

fn main() {
    let e = E::B(String::from("123"));
    let x = E::X;
    assert_eq!(e, E::B(String::from("123")));
    assert_eq!(x, E::X);
    include!("foo.txt");
    print2();

    let a = 3;
    let b = 27;
    debug_assert!(a + b == 30, "a = {}, b = {}", a, b);

    println!("{}", message());
    unsafe {
        hello();
        println!("{}", abs(a - b));
    }
}